Light connectivity and autonomous mobility

Abstract

Light and/or Inactive state connectivity and/or autonomous mobility techniques are contemplated. A WTRU may, for example, have an inactive/idle mode, a light connected/loosely connected/Inactive mode and/or a connected/fully connected/Active mode. A WTRU in light connected mode may have a WTRU context stored in a RAN. A WTRU may perform an area monitoring procedure while in light connected state. A WTRU may engage in autonomous mobility during light connectivity. A WTRU may move within a logical area (e.g., a RAN paging area), perhaps without notifying the network. The WTRU may provide notice when it has moved outside a logical area (e.g., update RAN paging area). Mobility in light connected state may be network controlled (e.g., to enable handover when data transfer may be allowed and/or ongoing). A WTRU may be reachable during a light connectivity state. A WTRU may engage in autonomous mobility during light connectivity and/or an Inactive state.

What is claimed is: 
     
       1. A wireless transmit/receive unit (WTRU) comprising a receiver, a transmitter, and a processor, wherein:
 the receiver is configured while in a first radio resource control (RRC) state to:
 receive, from a network entity, (i) an indication to the WTRU to transition to a second RRC state and (ii) any one or more of an indication of (a) one or more logical channels (LCHs) or (b) one or more radio bearers that are available for uplink (UL) transmission while the WTRU is in the second RRC state; 
 
 the processor is configured to:
 transition the WTRU from the first RRC state to the second RRC state; 
 
 and 
 the transmitter is configured to:
 in accordance with the WTRU being at least: (1) in the second RRC state, (2) UL data associated with the indicated one or more LCHs or radio bearers becoming available for transmission, and (3) a portion of the UL data satisfying one or more criteria for transmission, transmit the portion of the UL data, an identity of the WTRU, and an RRC message to request the WTRU to be set to the first RRC state. 
 
 
     
     
       2. The WTRU of  claim 1 , wherein the transmitter is configured to:
 on condition that the WTRU is in the second RRC state, and UL data associated with an LCH not among the indicated one or more LCHs becomes available for transmission, transmit an identity of the WTRU and the RRC message to request the WTRU to transition back to the first RRC state. 
 
     
     
       3. The WTRU of  claim 1 , wherein the one or more criteria for transmission comprise any of:
 a criterion that an amount of the UL data is less than a predetermined threshold; and 
 a criterion that a size of an available UL grant can accommodate the amount of the UL data. 
 
     
     
       4. The WTRU of  claim 1 , wherein the processor is configured to perform monitoring of a control channel for a time duration after the UL data is transmitted in the second RRC state. 
     
     
       5. The WTRU of  claim 1 , wherein the transmitter is configured to:
 on condition that the WTRU is in the second RRC state, and UL data associated with a radio bearer not among the indicated one or more radio bearers becomes available for transmission, transmit an identity of the WTRU and the RRC message to request the WTRU to transition back to the first RRC state. 
 
     
     
       6. The WTRU of  claim 1 , wherein the second RRC state is an RRC inactive state or a light connected state. 
     
     
       7. The WTRU of  claim 1 , wherein the first RRC state is an RRC connected state. 
     
     
       8. The WTRU of  claim 1 , wherein the first RRC state is different from the second RRC state. 
     
     
       9. The WTRU of  claim 1 , wherein the UL data is in a buffer of the WTRU when becoming available for transmission. 
     
     
       10. The WTRU of  claim 1 , wherein the transmitter is configured to:
 on condition that the UL data associated with any one or more of 1) the indicated one or more LCHs or 2) the indicated one or more radio bearers becomes available for transmission, and the UL data satisfies one or more criteria for transmission while in the second RRC state, transmit the UL data and an identity of the WTRU while in the second RRC state. 
 
     
     
       11. A method used by a wireless transmit/receive unit (WTRU) for wireless communications, the method comprising:
 receiving, from a network entity, while in a first radio resource control (RRC) state, (i) an indication to the WTRU to transition to a second RRC state and (ii) any one or more of an indication of (a) one or more logical channels (LCHs) or (b) one or more radio bearers that are available for uplink (UL) transmission while the WTRU is in the second RRC state; 
 transitioning the WTRU from the first RRC state to the second RRC state; and 
 in accordance with the WTRU being at least: (1) in the second RRC state, (2) UL data associated with the indicated one or more LCHs or radio bearers becoming available for transmission, and (3) a portion of the UL data satisfying one or more criteria for transmission, transmitting the portion of the UL data, an identity of the WTRU, and an RRC message to request the WTRU to be set to the first RRC state. 
 
     
     
       12. The method of  claim 11 , wherein the one or more criteria for transmission comprise any of:
 a criterion that an amount of the UL data is less than a predetermined threshold; and 
 a criterion that a size of an available UL grant can accommodate the amount of the UL data. 
 
     
     
       13. The method of  claim 11 , further comprising:
 on condition that UL data associated with a radio bearer not among the indicated one or more radio bearers becomes available for transmission, transmitting, while in the second RRC state, the identity of the WTRU and the RRC message to request the WTRU to transition back to the first RRC state. 
 
     
     
       14. The method of  claim 11 , wherein the first RRC state is different from the second RRC state. 
     
     
       15. The method of  claim 11 , wherein the second RRC state is an RRC inactive state or a light connected state, and wherein the first RRC state is an RRC connected state.